Democratic presidential hopeful Bernie Sanders will depart from Detroit to join patients on a search for cheaper prescription drugs in Canada.

A communications director for the Sanders campaign confirmed the bus trip will start in Detroit days before the city hosts the second Democratic presidential debate on July 30 and 31. Sanders’ campaign announced Thursday that he will ride with diabetes patients to buy insulin that’s available at cheaper prices in Canada than in the U.S on July 28.

I'll never forget this. In 1999, I took working class women, struggling with breast cancer, to Canada to buy the same medication for 1/10th of the price they were paying in the US. pic.twitter.com/BnCoPjqlpl

Sanders made a similar trip to Canada two decades ago, when he joined constituents with breast cancer on a trek to buy medication that was 10 times more expensive in Vermont. He will travel from Detroit to Canada with members of Insulin4All.

During his campaign for the Democratic Party nomination, Sanders criticized greed in the pharmaceutical industry. Sanders said the price of drugs like insulin have been artificially raised in recent years, despite an assertion from President Donald Trump that prescription drug prices are going down.

Sanders also blames pharmaceutical and health insurance lobbies for the rising costs. As president, Sanders promised to cut the cost of prescription drugs in half.

During an interview with Good Morning America, Sanders said his Medicare-for-All proposal would give Americans free to choose their doctor and hospital, but dissolve the private insurance market.

“Of course the insurance companies and the drug companies like the current system, they’re doing just great,” Sanders said. “Meanwhile, we are spending as a nation twice as much person as people of other countries around the world.”

Americans should not die without the medication they need because drug companies want to make even bigger profits. I’m running for president because we need to take on the pharmaceutical industry's outrageous greed and lower drug prices in this country.

“Because of pharmaceutical industry greed, the U.S. price of insulin has nearly doubled in recent years, even though the drug can be purchased for one-tenth of the price in Canada,” the campaign said in a release. “That price discrepancy is widespread across many medicines, which has fueled the more than $69 billion in annual pharmaceutical industry profits, even while millions of Americans cannot afford the prescription drugs they need.”

Earlier this year, Sanders introduced a set of bills to aimed at slashing the high costs of drugs. The bills would allow the Department of Health and Human Services to negotiate lower prices for drugs under Medicare and import cheaper drugs from countries like Canada.

Sanders also sponsored legislation that would strip drug companies of their monopolies if drug prices are higher than other countries.

Prescription drug prices have emerged as key issue for Democrats and the party’s base. Several presidential candidates have plans they say would lower drug costs, including rival U.S. Sen. Elizabeth Warren, D-Mass.

U.S. Sen. Kirsten Gillibrand released her plan to cut the cost of prescription drugs during her “Trump broken promises tour” through Pennsylvania, Ohio and Michigan. During her first stop in Pennsylvania Thursday, Gillibrand proposed creating a pharmaceutical czar to audit predatory business practices of the pharmaceutical industry.

She would also penalize drug companies that increase prices without justification. Her plan also calls for guidelines to import safe and affordable drugs from Canada.

Gillibrand will visit Oakland County, Flint and Lansing on Friday.

Sanders was among the first candidates to campaign in Michigan, holding an April rally in Macomb County. Sanders will be back in Michigan on July 24 to participate in a presidential candidate forum hosted by the NAACP.

In April, Sanders reflected on his 2016 Democratic primary win in Michigan, at the time considered a long shot. Michigan voters helped kick off a “political revolution” that started with Sanders’ first campaign, he told the crowd.

He said winning Michigan will be essential to defeating Trump in 2020. The state was tagged as a key battleground for both parties after the president became the first Republican to turn Michigan red since 1988.

Trump narrowly won Michigan by 10,704 votes in 2016, but the only statewide election since then swept in a wave of Democratic candidates last year.

Sanders performed well among likely Michigan voters in early primary polls. He beat Trump in several hypothetical head-to-head matchups and consistently secured a second place spot among the crowded primary field.

Former Vice President Joe Biden remains the front-runner. He is scheduled to hold a July 24 rally in Detroit ahead of the debate.